package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    /**
     * 用户登录
     *
     * @param userLoginDTO
     * @return
     */
    public User login(UserLoginDTO userLoginDTO) {

        String openid = getOpenId(userLoginDTO);
//        判断openid是否为空，如果为空表示登陆失败，抛出业务异常
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
//        判断当前用户是否为新用户
        User user = userMapper.getByOpenId(openid);
//        如果是新用户，自动完成注册
        if(user == null){
            user.setOpenid(openid);
            user.setCreateTime(LocalDateTime.now());
            userMapper.insert(user);

        }
//        返回这个用户对象
        return user;
    }

    private String getOpenId(UserLoginDTO userLoginDTO) {
        //        调用微信接口服务，获得当前微信用户的openid
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", userLoginDTO.getCode());
        map.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
